L19wa monitor After my monitor has been on for a couple of hours i get this hissing sound & the screen has flickering lines going up & down it. Initially i can stop this by runnig through the picture mode options i.e txt or economy & then back to picture mode but after a while this doesn't help anymore.
My monitor is about 4 yrs old.
Any ideas what the problem might be?

5 Suggested Answers

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One bad lead can cause a computer to continue on a cycle or
to shutdown or fail to detect your hard drive

Test all leads that attach to your hard drive including
electrical extensions IDE,SATA

the leads from your"((motherboard to your hard drive))"make sure they have a secure connection and are not faulty or just
replace them there probably old and faulty

make sure all leads that are attached to your drives dvd\cd
3 1/2 inch floppy have secure connections and are not faulty even the
electrical extensions or just replace them they could be faulty a computer
needs its connections to continue its cycle and have an end so any faulty leads
will end up with a computer error If your computer came with a motherboard disc
the drivers could be on it or you might have a dirty graphics card remove the
graphics card and clean the socket

click start control panel
sounds and audio devices select advanced there might be a tick in the mute box
untick it or select audio from the microphone drop down list make sure you
have the right one selected and in the volume box make sure the microphone box
has a tick in it or select the voice tab and make sure that you have the right
media selected also select volume make sure the box for microphone has a tick
in itclick start control panel
sounds and audio devices select advanced there might be a tick in the mute box
untick it:
if your computer came with
a motherboard disc the sound drivers could be on it:click start control panel
administrive tools computer management device manager scroll to sound,video and
game controllers you might see a yellow question mark? Right click to reinstall
drivers click start control panel
sounds and audio,volume,advanced,speakers make sure you have selected the (((appropriate speakers)))
also audio you will find 3 drop down lists make sure you have the correct
settingstherealsoclick start control panel
sounds and audio devices select advanced there might be a tick in the mute box
untick itclick start control panel
sounds and audio devices you can adjust the volume there also select speaker
volume you can change your settings there you can also tick in the box place
icon in taskbar if his does not fix the
problemclick start control panel sounds and
audio,volume,advanced,speakers select the appropriate speakers from the drop
down list or navigate to the device manager scroll to system devices + to
expand,system speaker right click properties then select use this device
(enable) also you might checkthe speakers plug/outlet is
usually at the back of the computer you will have to open up the computer
to check the lead attached to the rear of the input plug make sure the
connection is goodtry cleaning your computer of dust using a fine air blower from a
compressor making VERY sure that there is no MOISTURE in the air line
specifically around the sound card and the CPU central processing unit dust
causes static to build up in a computer hope this helps:

Hi,
Welcome to Fixya. I would like to verify when you said that it won't pass the start up screen is it the POST Screen the black screen with the information of the unit or the Windows loading screen? Do you have an error message? Please provide the information needed to be able to fix the issue.
Thanks

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Related Questions:

If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

screen is going bad which is why its flickering and has the lines across the screen. Theres a board behind the lcd and when that doesn't process the voltage properly it can cause the screen to flicker. White lines across the screen means the screen is going bad. At this point unless your monitor is under warranty, go ahead and replace it.

The fact that you can see a faint picture indicates that the monitor is working but the backlight circuit has a problem. The typical failures are blown transistors or bad capacitors. This can be troubleshot if you know how to unsolder and check the components with a meter. Don't know how technical you are, but if you are not, you could take to to an electronic repair service to fix. Hope this helps you.

The problem is in the monitor screen, there is a large circuit board connected behind the main display screen. The video signal is feed to the main board and generates the proper color balance, the second problem is the lamp behind the display is flickering and breaking down. To repair this will not be cost effective, cheaper to replace the monitor. But I would suggest hooking a spare monitor to the computer to make sure there are no additional issues.

Does the cord plug directly from the wall into the monitor, or is there a power "brick" adapter between?

If there's a "brick" listen to see if the hissing is coming from the monitor itself or the brick. If the hissing is coming from the brick you may just need a new power adapter.

If there's no brick or the hissing is coming from the monitor, the monitor probably needs repair. With the price of LCD monitors these days compared to the price of labor, you're probably better off getting a new LCD monitor. Just make sure you take your old one to a proper E-Waste facility so it doesn't pollute the environment.

The high voltage (HV) flyback transformer is a very possible cause of this. This could be repaired by a qualified technician, but the cost may not be worth it. New 17" monitors can be acquired for free sometimes (think craigslist)